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C# Developer

Job in Northampton, Northamptonshire, NN1, England, UK
Listing for: The ONE Group Ltd
Full Time position
Listed on 2026-01-28
Job specializations:
  • Software Development
    Software Engineer, C# / Unity Developer, Full Stack Developer, Backend Developer
Job Description & How to Apply Below

A well-established and business-critical IT team is looking for a C# Developer to join them on a permanent basis. This role sits at the heart of the organisation’s internal systems, supporting both the development of new applications and the ongoing improvement of existing platforms that underpin day-to-day operations.

What You’ll Be Doing:
  • Designing, developing, testing, and maintaining robust software applications that support core business objectives.
  • Enhancing and supporting existing systems to ensure performance, reliability, and usability.
  • Working collaboratively with cross-functional teams and stakeholders to define requirements and deliver solutions end-to-end.
  • Identifying bottlenecks, bugs, and performance issues, and implementing effective fixes and improvements.
  • Contributing to software architecture decisions with a focus on scalability, security, and maintainability.
  • Leading and participating in code reviews, promoting best practices across the development team.
  • Mentoring junior developers and supporting skill development within the wider IT team.
  • Strong commercial experience developing with C#.
  • Solid understanding of software development best practices and coding standards.
  • Experience working with relational databases, ideally SQL Server or Oracle.>
  • Ability to analyse, debug, and optimise applications for performance and reliability.
  • Experience with Win Forms.
  • Exposure to Power BI or Crystal Reports.
  • Understanding of XML and modern internet technologies.
  • Familiarity with UML, class modelling, or flow diagramming.
  • Experience using code versioning tools.
  • Prior involvement in architectural design or mentoring responsibilities.

If this sounds like you - hit apply now!

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